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Boo Party! is the first secret level of Joke's End in the Minion Quest: The Search for Bowser mode in Mario & Luigi: Superstar Saga + Bowser's Minions. In order to obtain this level, the player has to use certain amiibo to unlock it.
The level has four battles. The first battle has two Bomb Boos, five Boos, and a Boo captain. The second battle has two Boos, five Tail Boos, and a Tail Boo captain. The third battle has two Boos, five Bomb Boos, and a Boo captain. The fourth and final battle has one Boo, two Tail Boos, two Bomb Boos, two Big Boos, and a Big Boo captain.